Pagina/12 reports that the remains of one of the disappeared, Ana Teresa Diego, have been identified in an unmarked grave in Avellaneda cemetery, Buenos Aires.
Diego was an astronomy student and Communist activist when she was abducted in 1976. She even has an asteroid named after her, "Anadiego", Asteroid 11441. Her mother, Zaida Franz, is one of the founding members of the Madres de Plazas de Mayo. Now aged 84, she commented that the discovery "filled an emptiness with light" and also called for continued action for justice against the military perpetrators and civil accomplices of the dictatorships.
“Es como que está otra vez en la familia” (Pagina/12)
And here is an excellent English-language piece about naming the asteroid after Diego:
Asteroid named for ‘disappeared’ Argentine student (Inquirer News)